1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/* 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * [The "BSD licence"] 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright (c) 2005-2008 Terence Parr 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * All rights reserved. 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Conversion to C#: 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc. 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * All rights reserved. 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Redistribution and use in source and binary forms, with or without 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * modification, are permitted provided that the following conditions 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * are met: 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 1. Redistributions of source code must retain the above copyright 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notice, this list of conditions and the following disclaimer. 15324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 2. Redistributions in binary form must reproduce the above copyright 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * notice, this list of conditions and the following disclaimer in the 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * documentation and/or other materials provided with the distribution. 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 3. The name of the author may not be used to endorse or promote products 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * derived from this software without specific prior written permission. 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 21324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruvernamespace Antlr.Runtime.Tree 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver{ 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary> 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * How to execute code for node t when a visitor visits node t. Execute 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * pre() before visiting children and execute post() after visiting children. 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * </summary> 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public interface ITreeVisitorAction 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary> 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Execute an action before visiting children of t. Return t or 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * a rewritten t. It is up to the visitor to decide what to do 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * with the return value. Children of returned value will be 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * visited if using TreeVisitor.visit(). 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * </summary> 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver object Pre(object t); 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 51324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /** <summary> 52324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Execute an action after visiting children of t. Return t or 53324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * a rewritten t. It is up to the visitor to decide what to do 54324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * with the return value. 55324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * </summary> 56324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 57324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver object Post(object t); 58324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 59324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 60324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public class TreeVisitorAction 61324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : ITreeVisitorAction 62324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 63324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Func<object, object> _preAction; 64324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Func<object, object> _postAction; 65324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 66324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public TreeVisitorAction(Func<object, object> preAction, Func<object, object> postAction) 67324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 68324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver _preAction = preAction; 69324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver _postAction = postAction; 70324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 71324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 72324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public object Pre(object t) 73324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 74324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (_preAction != null) 75324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return _preAction(t); 76324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 77324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return t; 78324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 79324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 80324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public object Post(object t) 81324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 82324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (_postAction != null) 83324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return _postAction(t); 84324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 85324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return t; 86324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 87324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 88324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver} 89